Flash memory architecture implementing interconnection redundancy

ABSTRACT

The present disclosure relates to a memory architecture comprising a plurality of subarrays of memory cells, a plurality of sense amplifiers connected to the subarrays, a plurality of original pads, at least one redundant pad, multiple data lines, and a redundant register connected to the plurality of original pads, to the plurality of redundant pads and to the data lines. The redundant register implementing an interconnection redundancy and connecting one of the redundant pads to the data lines when an addressed original pad is found defective. The disclosure also relates to a System-on-Chip (SoC) component comprising a memory architecture, and an interconnection redundancy managing block included into the memory architecture. A related memory component and related methods for managing interconnection redundancy of the memory architecture and/or the SoC are also disclosed.

This application is a National Stage Application under 35 U.S.C. § 371of International Application Number PCT/IB2019/000438, filed May 31,2019, the entire contents of which are incorporated herein by referencein its entirety.

TECHNICAL FIELD

The present invention relates to a Flash memory architecture and inparticular to a Flash memory architecture implementing interconnectionredundancy.

BACKGROUND

Non-volatile memory can provide persistent data by retaining stored datawhen not powered and can include NAND Flash memory, NOR Flash memory,Read Only Memory (ROM), Electrically Erasable Programmable ROM (EEPROM),Erasable Programmable ROM (EPROM), and resistance variable memory suchas phase change random access memory (PCRAM), self-selectingchalcogenide-based memories, resistive random access memory (RRAM), 3DXPoint memory (3DXP) and magnetoresistive random access memory (MRAM),among others.

More particularly, a Flash memory is a type of non-volatile memory thatretains stored data and is characterized by a very fast access time.Moreover, it can be erased in blocks instead of one byte at a time. Eacherasable block of memory comprises a plurality of non-volatile memorycells arranged in a matrix of rows and columns. Each cell is coupled toan access line and/or multiple data lines. The cells are programmed anderased by manipulating the voltages on the access and data lines.

Non-volatile Flash memories are today one of the fundamental buildingblocks in modem electronic systems particularly for Real Time OperatingSystems (RTOS). The operation of non-volatile Flash memories is managedby a controller including an embedded firmware, such controllerperforming the required write/read/erase operations.

Memory cells are keen to defect, namely in very aggressive lithographicnodes. Redundancy is used to bypass defective cells and repair memoryarchitecture failing a testing phase or showing failures in the field,for the so called redundancy on the fly. The root cause of defect can bedifferent, i.e. depleted cells, defective oxide in the cell, defects inthe connection with the physical cell, for instance due a broken vias, ashort end cup, a oxide defectivity, etc.

In NOR memory devices, redundancy is usually by column. In particular,redundancy repairs local defect by changing a physical column comprisingdefective cell or cells with another one without defects, the redundancycolumns being usually positioned at a boundary area of the memory array.

The implementation of the redundancy can be made by linking an addressof a defective column and a target new address of a redundant column, sothat, when the defective column is addressed, the memory device willenable the redundancy to store/read the content in the differentredundant column being not defective.

Currently, the technology of complex semiconductor structures known asSystem-on-Chips (SoC) provides the integration of at least an embeddednon-volatile memory in the system. However, the embedded memory, withthe current technologies, is becoming the big macro in a SoC and it isnot effective to increase the size, for example to more than 128 Mbit.In other words, nowadays the embedded memory shows a minimum notintegrable density.

In other words, embedded memory in SoCs is more and more difficult to bemanaged when the lithography node is below a technology limit, forinstance below 28 nm.

Connection between an embedded memory and other portions of a SoC alsoraises defectiveness problems tied to the contact between the pads ofthe memory and the system.

Large connection devices, as a Flash memory within a SoC, also calledembedded Flash replacement, can thus have defects due to theinterconnectivity, whatever is the redundancy strategy applied to theFlash memory architecture.

The presence of an interconnected pads defect can jeopardize completelythe working of the SoC comprising the Flash memory, wasting a largeamount of money, being the SoC, embedded Flash and package to bediscarded, the corresponding silicon cost totally wasted.

Therefore, there is a need for providing a solution for defects tied tothe interconnecting pads of an embedded Flash memory and a SoC, allowingto repair the already stacked device and improving the yield of amanufacturing process of such systems.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A shows a block diagram of a Flash memory subarray comprisingsense amplifiers and a boundary cell;

FIG. 1B shows an enlarged view of a detail of the Flash memory subarrayof FIG. 1A;

FIG. 2A shows a redundant register implementing single-padinterconnection redundancy in accordance with an embodiment of thepresent disclosure;

FIG. 2B shows a redundant register implementing multi-padsinterconnection redundancy in accordance with an embodiment of thepresent disclosure;

FIG. 2C shows a Flash memory architecture implementing interconnectionredundancy using the redundant register of FIG. 2A in accordance with anembodiment of the present disclosure;

FIGS. 3A and 3B show different working conditions of a selecting circuitof a Flash memory architecture implementing interconnection redundancyusing the redundant register of FIG. 2A in accordance with an embodimentof the present disclosure;

FIGS. 4 and 5 show an exemplary method for managing interconnectionredundancy of a memory architecture in accordance with an embodiment ofthe present disclosure.

DETAILED DESCRIPTION

With reference to those figures, a memory architecture comprising anarray of memory cells, in particular a Flash memory array provided witha selecting circuit implementing interconnection redundancy will bedisclosed herein.

The example embodiment of FIG. 1A is a memory architecture 100comprising a Flash memory subarray 110, the memory architecturecomprising a plurality of subarrays all having a same structure.

More particularly, the Flash memory subarray 110 is connected to a senseamplifier 120, in turn connected to a boundary or Jtag cell 130, able tomanage input and output serial data, SIN and SOUT, as well as input andoutput parallel data, PIN and POUT, respectively.

The output parallel data POUT are provided to a SoC (not shown)comprising the memory architecture 100. The memory architecture 100 isconnected to the SoC using any packaging techniques.

A low signal count interface 140, with capability to modify the internalcontent of the Flash memory subarray 110, in particular using functionalpins and corresponding signals TDI, TDO, tms, tck, trst according to theJtag protocol, could be also included in the memory architecture 100,between the sense amplifiers 120 and the SoC, connected to the Jtagcells 130 whose parallel outputs POUT form interconnection channels 150with the SoC, as shown in FIG. 1B.

As will be explained in the following description, the memoryarchitecture 100 implements an interconnection redundancy able tocorrect defects tied to the interconnections between the memoryarchitecture 100 and the Soc comprising it. Redundancy is replicated foreach subarray of the memory architecture, the subarray outputs being theinterconnection channels 150 with a SoC, not shown in the figures.

In particular, interconnection defects are tied to defective pads ordefective connection between pads and the memory architecture 100according to the embodiments of the present disclosure providesredundancy for all possible defective or defectively connected pads.

According to the subdivision of a memory architecture into a pluralityof subarrays, 168 pads per channel is the current targetedimplementation for a Flash memory architecture to be embedded in a SoC.Suitably, the present disclosure relates to a memory architecture 100managing one or more defect(s) on any of the 168 pads.

In order to implement interconnection redundancy, the memoryarchitecture 100 suitably comprises a redundant register 200,schematically shown in FIG. 2A. The redundant register 200 is addressedusing a Jtag port in case of factory redundancy and the Flash controlleror the host in case of on-field redundancy so as to properly set theredundancy, with or without the low pin count interface 140, such as aJtag interface.

In particular, as shown in FIG. 2A, for each extended page of the Flashmemory subarray 110, the redundant register 200 receives from thecommunication channel a bit address of an addressed memory cell of theFlash memory subarray 110 connected to a corresponding addressed pad, bymeans of a number of bit sufficient to identify the defective pad, forinstance 8 bits, to be able to address 256 possible defective pads,sufficient for the example embodiment of 168 pads per channel and henceable to manage one defective pad. The pads bar for each Flash memorysubarray 110 is indicated as 210 in FIG. 2A.

The redundant register 200 stores, using the Jtag interface, the info toenable the redundancy; the register can be programmed in factory and/orby the flash controller and/or the SoC, when the on field redundancy,also called on the fly, is implemented and available. More particularly,when the redundancy on the fly is implemented, the Jtag and/or the SoCand/or the Host can be used to program the register.

Moreover, an address bus, when latched, is used as read address in theraw data buffers associated to the raw address buffers.

As will be clear from the following description, the redundant register200 implements a logic intercepting defects which is always on andcompares any address used by each Flash memory subarray 110 of thememory architecture 100 and the SoC embedding it so to be sure that thedata is correctly routed to the SoC.

When implementing single-pad redundancy, according to the embodimentshown in FIG. 2A, the redundant register 200 comprises a first portion220 being a redundant flag of 1 bit (ON/OFF) indicating the usage of theredundancy, a second portion 230 for storing a location or address ofthe pads out of 168 that defective and a third portion 240 for storing afurther location or address of a spare pad being used as redundantresource.

When implementing multi-pads redundancy, according to the embodimentshown in FIG. 2B for up to 4 pads redundancy, the redundant register 200comprises a first portion 220 being a redundant flag of 1 bit (ON/OFF)indicating the usage of the redundancy, a second portion 230 comprising4 (in the example here described) groups of bits for storing fourlocations or addresses of the pads out of 168 that defective (forexample each group includes 8 bits, to be able to address 256 possiblecombinations and therefore one of the 168 possibly defective pads) and athird portion 240 for storing a further location or address of fourspare pads being used as redundant resources.

It can be indicated that the multi-pads redundancy is thus implementedincreasing the defective pads location fields of the second portion 230and by increasing the Redundant Resource bits of the third portion 240;according to an example, with reference to the embodiment shown in FIG.2B, the defective pads location fields are 8 bits, and the secondportion 230 is thus 8 bits multiplied by 4, i.e. the number of the padsthat can be used for the redundancy and similarly, the RedundantResource bits are up to 4, each bit enabling the intercepting of thefailing pad in the channel according to the following logic:

-   -   Bit 0: redundancy resource pad 0    -   Bit 1: redundancy resource pad 1    -   Bit 2: redundancy resource pad 2    -   Bit 3: redundancy resource pad 3

More particularly, according to the single-pad redundancy embodiment ofthe present disclosure only a spare pad is uses, the third portion 240being a field of 1 bit, in essence a further flag. In some embodiments,such third portion or further flag is not used, and the sole redundancyresource pad is directly activated; for example, the pad may be hardwired. According to the multi-pads redundancy embodiment, more than onespare pad is used, the third portion 240 being more than one bit, forinstance, a 4 bits field able to implement up to four redundantlocations or addresses of the spare pads, along with a four fields of 8bits of the second portion 230.

It can be thus indicated that the first portion 220 of the redundantregister 200 is a flag indicating that the redundancy is ON, the secondportion 230 of the redundant register 200 is a pads defective area andthe third portion 240 of the redundant register 200 is a redundancyresource field.

According to the embodiment, when a pad is found defective, its addressis stored in the second portion 230 and the redundant flag of the firstportion 220 is enabled (ON), so that one of the redundant pads, havingbeen enabled by the further enabling signal stored in the third portion240, is switched with the defective one. In other words, when theredundant flag of the first portion 220 is ON, the corresponding logicintercepting defects is always on and compares any address used by eachFlash memory subarray 110 to substitute the address of memory cellscorresponding to pads being found defective.

In particular, the redundant flag of the first portion 220 is ON, thecontent of the third portion 240 being the redundant resource is used tosend the data to the SoC.

During the normal working, the universe of pads is monitored andcompared with the universe of defective pad location sections of thewhole enable redundant registers; when the defective location isaddressed, the switch with the redundant resources is executed, theredundant flag of the first portion 220 being checked for its ownstatus: enable or disable, i.e. ON or OFF.

In the case that the enable status is set (ON), the redundant pad whoseaddress is stored in the third portion 240 is routed using amulti-channel MUX, so to replace the defective pad whose address isstored in the second portion 230.

The redundancy register 200 is replicated in each sub array and thecontent of the corresponding portions 220, 230 and 240 stored in theFlash configuration area, because the corresponding stored data, asother setting data, are stored only once.

As already indicated, according to the embodiments of the disclosure,the redundancy is always on after the power up of the Flash memoryarchitecture 100 and the SoC embedding it so as to monitor continuouslythe communication channel, i.e. 168 pads, in the case taken as anexample in the present description.

In case of a multilayer memory architecture 100, a defective pad is tobe substituted for all layers or pages connected to such a defectivepad.

For instance, in case of an embedded Flash Replacement architecture, asschematically shown in FIG. 2C, the redundant register 200, alsoindicated as Red_R, is usually split in a high page 200H and a low page200L.

According to the above explained interconnection redundancy mechanism,in case a defective pad is found and the redundant flag of the firstportion 220 is enabled (ON), the redundant register 200 provides forsubstituting an original cell address 230H with a redundant cell address240H in the high page 200H as well as an original cell address 230L witha redundant cell address 240L in the low page 200L. The pad redundancyapplies to all the extended pages of the subarray and any data in, ifthe defect is in the used pads, as for flexible TDI.

In particular, a MUX 250 will receive the output parallel data POUT ofthe redundant cells 240H and 240L instead of the output parallel dataPOUT of the original cells 230H and 230L when the redundant flag 220 isenabled or ON. The MUX 250 functionality is described below withreference to FIGS. 3A and 3B.

The memory architecture 100 may in particular comprise a selectioncircuit 300 for implementing the interconnection redundancy according toan embodiment of the disclosure, as shown in FIG. 3A.

In particular, the selection circuit 300 is connected to a pad of thememory architecture 100, indicated as original pad OP as well as atleast one redundant pad RP and receives addresses and enable signalsfrom the redundant register 200.

More particularly, the selection circuit 300 comprises a first switchSW1 inserted between multiple data lines DL and the original pad OP anda second switch SW2 inserted between the data lines DL and the redundantpad RP. The first switch SW1 is driven by a first redundant signal RS1being an inverted value of the redundant flag stored in the firstportion 220 of the redundant register 200 obtained through an invertinggate INV, while the second switch SW2 is driven by a combination betweenthe first redundant signal RS1 and a second redundant signal RS2 storedin the third portion 240 of the redundant register 200 obtained througha logic gate LG, being an AND gate.

In the example embodiment of FIG. 3A, the communication channel providesthe redundant register 200 with an address corresponding to a bit beingfound as connected to a correctly working original pad OP, whose addressAddOP is stored in the second portion 230 of the redundant register 200.In particular, the Bit #4 (000 . . . 1000) of a memory page is connectedto a “correct”, i.e. a not defective original pad OP.

In this case, the enabling flag stored in the first portion 220 is setequal to 1, so that the first redundant signal RS1 is set equal to 0 andthe first switch SW1 is closed by the inverted value equal to 1.Moreover, independently from the value of the second redundant signalRS2, the logic gate LG opens the second switch SW2 due to the firstredundant signal RS1 being set equal to 0.

In this way, the data of the data lines DL are provided to the originalpad OP, which is correctly working.

In the example embodiment of FIG. 3B, the communication channel providesthe redundant register 200 with an address corresponding to a bit beingfound as connected to a defective original pad OP, whose address AddOPis stored in the second portion 230 of the redundant register 200. Inparticular, the Bit #4 (000 . . . 1000) of a memory page is connected toa “bad”, i.e. a defective original pad OP.

In this case, the enabling flag stored in the first portion 220 is setequal to 0, so that the first redundant signal RS1 is set equal to 1 andthe first switch SW1 is open by the inverted value equal to 0. Moreover,the value of the second redundant signal RS2 is set equal to 1 so thatthe logic gate LG, also receiving the first redundant signal RS1 beingset equal to 1, closes the second switch SW2.

In this way, the data of the data lines DL are provided to the redundantpad RP, so effectively bypassing the original pad OP which is notcorrectly working.

The redundant register 200 and the selection circuit 300 thus form aninterconnection redundancy managing block included into the memoryarchitecture 100.

The exemplary configurations shown in FIGS. 3A and 3B relates to asingle defective pad, but it is immediate to verify that the selectioncircuit 300 can implement the proposed interconnection redundancy forany number of defective pads, up to 168, by increasing the number ofregisters to store the defect pad and the new one.

The memory architecture 100 can be included, in particular embedded, ina System-on-Chip (SoC) component and the interconnection redundancy mayapply to pads connected to the SoC.

An exemplary method for managing interconnection redundancy of a memoryarchitecture 100 comprising a plurality of subarrays of memory cells anda plurality of original pads OP is schematically shown in FIG. 4, themethod 400 comprising the steps of:

-   -   step 410: verifying a correct working of one of the original        pads OP; and    -   step 420: in case the original pad OP is correctly working,        connect the original pad OP to multiple data lines DL; or    -   step 430: in case the original pad OP is not correctly working,        connect a redundant pad RP to the data lines DL.

More particularly, making reference to FIG. 5, the method 500 comprisesthe steps of:

-   -   step 510: storing, using the Jtag interface, info to enable the        redundancy;    -   step 520: storing a redundant flag in a first portion 220 of the        redundant register 200 for indicating the use of a redundant pad        RP; a first redundant signal RS1 is associated to the redundant        flag;    -   step 530: storing an address of a defective original pad OP to        be switched with the redundant pad RP in a second portion 230 of        the redundant register 200; and    -   step 540: storing in a third portion 240 of the redundant        register 200 for addressing the redundant pad RP when the        original pad OP is defective by not correctly working; a second        redundant signal RS2 is associated to the address stored in the        third portion 240.

It should be remarked that the redundant register 200 comprises only oneredundant flag per Flash memory subarray 110. In particular, in case ofmulti position defective, the redundant flag enabling redundancy is notto be repeated.

Summing up, the present disclosure provides a memory architecturecomprising a plurality of subarrays, each provided with aninterconnection redundancy mechanism implemented by a selection circuitconnected to a redundant register.

In this way, latent defects and/or a life defects can be fixed on thefly by a SoC comprising the memory architecture, using firmware routinesable to correctly control the redundant register and thus the selectioncircuit connected thereto.

It is underlined that the number of redundant pads being used can becustomized according to needs simply managing the address to be storedand the enabling flag.

The exemplary memory architecture implementing interconnectionredundancy also improves safety of the memory and of the Soc; inparticular the interconnection redundancy allows to reset errors due todefective or defectively connected pads, thus increasing the ECCcoverage, the ECC saving the system from single defect.

Moreover, the interconnection redundancy is suitably replicated for eachsubarray of the memory architecture.

It should be also remarked that the redundant register, in particularimplemented in the embedded Flash Replacement device, is in the SoC thatthe read page has a bit re-routed somewhere else.

In this way, the interconnection redundancy is a transparent strategy.

Moreover, the redundant register is addressed using the low signal countinterface 140 or Jtag interface, with or without a flexible TDI, whichis a programmable option to improve the performance of the working ofthe memory architecture as a whole.

The redundant register size would depend on the number of possibleredundant pads, a full interconnection redundancy being theoreticallypossible.

In a real implementation, the number of possible redundant pads anddefects that can be corrected is limited in view of the yield studyand/or the pads topology. In some embodiments, each channel (150 or 210)has its own redundant pad resources to repair one or more defective pads(among the 168 pads, in the example described above). In otherembodiments, the redundant pad resources may be shared among differentchannels; e.g., a spare pad resource for redundancy may be addressed toredund a defective pads in any of the interconnection channels of thesystem. For example, the redundant registers 200 of different channelsmay flag that redundancy is enabled (in first portion 220), store theaddress of the failing pad (in second portion 230) and store (in thirdportion 240) a location or address of a spare pad being used asredundant resource, the redundant resource being a shared resource.

Finally, it is underlined that the defective pads are also stored in theSoC, so as to be able to read the content of a defective pad in theredundant pad instead of the original one.

In the preceding detailed description, reference is made to theaccompanying drawings that form a part hereof, and in which is shown, byway of illustration, specific examples. In the drawings, like numeralsdescribe substantially similar components throughout the several views.Other examples may be utilized, and structural, logical and/orelectrical changes may be made without departing from the scope of thepresent disclosure.

Similar elements or components between different figures may beidentified by the use of similar digits. As will be appreciated,elements shown in the various embodiments herein can be added,exchanged, and/or eliminated so as to provide a number of additionalembodiments of the present disclosure. In addition, as will beappreciated, the proportion and the relative scale of the elementsprovided in the figures are intended to illustrate the embodiments ofthe present disclosure and should not be taken in a limiting sense.

As used herein, “a,” “an,” or “a number of” something can refer to oneor more of such things. A “plurality” of something intends two or more.As used herein, the term “coupled” may include electrically coupled,directly coupled, and/or directly connected with no intervening elements(e.g., by direct physical contact) or indirectly coupled and/orconnected with intervening elements. The term coupled may furtherinclude two or more elements that co-operate or interact with each other(e.g., as in a cause and effect relationship).

Although specific examples have been illustrated and described herein,those of ordinary skill in the art will appreciate that an arrangementcalculated to achieve the same results can be substituted for thespecific embodiments shown. This disclosure is intended to coveradaptations or variations of one or more embodiments of the presentdisclosure. It is to be understood that the above description has beenmade in an illustrative fashion, and not a restrictive one. The scope ofone or more examples of the present disclosure should be determined withreference to the appended claims, along with the full range ofequivalents to which such claims are entitled.

The invention claimed is:
 1. A memory architecture, comprising: aplurality of subarrays of memory cells, a plurality of sense amplifiersconnected to the subarrays; a plurality of original pads; at least oneredundant pad; multiple data lines; and a redundant register, split intoa high page and a low page, connected to the plurality of original pads,to the at least one redundant pad, and to the data lines; wherein theredundant register is configured to implement an interconnectionredundancy and to connect the at least one redundant pad to the datalines when an addressed original pad is determined to be defective bysubstituting an original cell address of the high page of the redundantregister with a redundant cell address of the high page of the redundantregister and substituting an original cell address of the low page ofthe redundant register with a redundant cell address of the low page ofthe redundant register.
 2. The memory architecture of claim 1, whereinthe redundant register comprises a first portion for indicating the useof the at least one redundant pad by storing a redundant flag.
 3. Thememory architecture of claim 1, wherein the redundant register furthercomprises a second portion for storing an address of defective originalpads to be switched with one of the redundant pads.
 4. The memoryarchitecture of claim 3, wherein the redundant register furthercomprises a third portion for storing an address of the at least oneredundant pad.
 5. The memory architecture of claim 4, further comprisinga selection circuit connected to the redundant register, to the originalpads and to the at least one redundant pad for implementing theinterconnection redundancy.
 6. The memory architecture of claim 5,wherein the selection circuit comprises: a first switch inserted betweenthe data lines and one of the original pads; a second switch insertedbetween the data lines and the at least one redundant pad; an invertinggate receiving a first redundant signal associated to the redundant flagstored in the first portion of the redundant register and proving aninverted value to command the first switch; an AND logic gate receivingthe first redundant signal and a second redundant signal associated tothe address stored in the third portion of the redundant register andproviding a combined value to command the second switch.
 7. The memoryarchitecture of claim 6, further comprising a MUX receiving the addressstored in the third portion of the redundant register to replace thedefective pad whose address is stored in the second portion of theredundant register.
 8. An interconnection redundancy managing block,comprising: an interconnection redundancy managing block connected to aplurality of original pads, to one or more redundant pads, and tomultiple data lines for memory cells, wherein the interconnectionredundancy managing block is split in a high page and a low page; and aselection circuit connected to the redundant register, to the originalpads, and to the one or more redundant pads; wherein the interconnectionredundancy managing block is configured to substitute one original paddetermined to be defective with one of the one or more redundant pads bysubstituting an original cell address of the high page of theinterconnection redundancy managing block with a redundant cell addressof the high page of the interconnection redundancy managing block andsubstituting an original cell address of the low page of theinterconnection redundancy managing block with a redundant cell addressof the low page of the interconnection redundancy managing block.
 9. Theinterconnection redundancy managing block of claim 8, wherein theredundant register comprises: a first portion for indicating the use ofat least one of the one or more redundant pads by storing a redundantflag; a second portion for storing an address of a defective originalpad to be switched with one of the redundant pads; and a third portionfor storing an address of one of the one or more redundant pads.
 10. Theinterconnection redundancy managing block of claim 9, wherein theselection circuit comprises: a first switch inserted between the datalines and one of the original pads; a second switch inserted between thedata lines and one of the one or more redundant pads; an inverting gatereceiving a first redundant signal associated to the redundant flagstored in the first portion of the redundant register and proving aninverted value to command the first switch; and an AND logic gatereceiving the first redundant signal and a second redundant signalassociated to the address stored in the third portion of the redundantregister and providing a combined value to command the second switch.11. The interconnection redundancy managing block of claim 10, furthercomprising a MUX receiving the redundant pad address stored in the thirdportion of the redundant register to replace the defective pad whoseaddress is stored in the second portion of the redundant register.
 12. Amethod for managing interconnection redundancy of a memory architecture,the method comprising: determining, by a redundant register split into ahigh page and a low page, one of a plurality of original pads of thememory architecture is functioning properly; and responsive todetermining the original pad is functioning properly, connect theoriginal pad to multiple data lines; or in case the original pad is notcorrectly working, connect a redundant pad, using interconnectionredundancy, to the data lines, by substituting an original cell addressof the high page of the redundant register with a redundant cell addressof the high page of the redundant register and substituting an originalcell address of the low page of the redundant register with a redundantcell address of the low page of the redundant register.
 13. The methodof claim 12, further comprising: storing a redundant flag in a firstportion of the redundant register for indicating the use of a redundantpad; storing an address of a defective original pad to be switched withthe redundant pad in a second portion of the redundant register; andstoring an address of the redundant pad in a third portion of theredundant register for addressing the redundant pad when the originalpad is defective by not correctly working.
 14. A System-on-Chip (SoC)component comprising: a plurality of subarrays of memory cells, aplurality of sense amplifiers connected to the subarrays; a plurality oforiginal pads; a plurality of redundant pads; multiple data lines; and aredundant register, split into a high page and a low page, connected tothe plurality of original pads, to the plurality of redundant pads, andto the data lines; wherein the redundant register implements aninterconnection redundancy and connects one of the plurality ofredundant pads to the data lines when an addressed original pad isdetermined to be defective by substituting an original cell address ofthe high page of the redundant register with a redundant cell address ofthe high page of the redundant register and substituting an originalcell address of the low page of the redundant register with a redundantcell address of the low page of the redundant register.
 15. The SoCcomponent of claim 14, wherein the redundant register comprises a firstportion for indicating the use of one of the plurality of redundant padsby storing a redundant flag.
 16. The SoC component of claim 14, furthercomprising a selection circuit connected to the redundant register, tothe original pads and to the redundant pads for implementing theinterconnection redundancy.
 17. The SoC component of claim 16, whereinthe selection circuit comprises: a first switch inserted between thedata lines and one of the original pads; a second switch insertedbetween the data lines and one of the redundant pads; an inverting gatereceiving a first redundant signal associated to the redundant flagstored in the first portion of the redundant register and proving aninverted value to command the first switch; an AND logic gate receivingthe first redundant signal and a second redundant signal associated tothe address stored in a third portion of the redundant register andproviding a combined value to command the second switch.
 18. The SoCcomponent of claim 17, further comprising a MUX receiving the redundantpad address stored in the third portion of the redundant register toreplace the defective pad whose address is stored in a second portion ofthe redundant register.
 19. The SoC component of claim 14, wherein theredundant register comprises a second portion for storing an address ofa defective original pad to be switched with one of the redundant pads.20. The SoC component of claim 14, wherein the redundant registercomprises a third portion for storing an address of one of the redundantpads for addressing the one of the redundant pads.